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Microcontroller-Based Speedometer-Cum-Odometer - Normally, digital speedometers are found only in luxury cars and high-end motorbikes. Even if your motorbike has a mechanical speedometer, what will you do when it gets damaged? First, you need...__ Electronics Projects for You
PCB Drill Speed Controller with 555 - Described here is a simple, inexpensive and useful circuit for electronics hobbyists. The circuit is nothing but a PCB drill speed controller, which can be used to control the speed of any 12VDC small pcb drilling units. Such portable units are now widely available, and even a hobbyist can make it without too much difficulty. __ Designed by T.K. Hareendran
RC Speed Controller - fed up of paying £20 for controllers? This 10amp pic version has braking and calibration features. __ Contact P. Townshend - EduTek Ltd
Sleep easy with this Desk fan speed reducer - EDN Design Ideas: 12/08/2014 This innovative AC motor control skips cycles. Most desk fans I have come across have three speeds: Full Speed, Almost Full Speed, and Off – useless if you want just a gentle air movement, and far too noisy if you are trying to get to sleep (in your bedroom of course, not at your work desk!). The squirrel cage induction motors they use have switches to two or more windings – and possibly a capacitor – to reduce the drive current. But unless the drive frequency is also reduced, the torque and speed stability are poor, so minimal speed reduction is usually available on these fans. Using a TRIAC to provide phase control of the voltage works poorly for the same reason, with the speed very sensitive to the TRIAC firing phase angle and fan load, and has a tendency to stall. Design by Mike Whybray
Speed Alarm for Cars; Pt 1 - is your license looking a bit a bit dodgey? This compact speed alarm will help you stick to the speed limits.__ SiliconChip
Speed Checker for Highways - While driving on highways, motorists should not exceed the maximum speed limit permitted for their vehicle. However, accidents keep occurring due to speed violations since the drivers tend to ignore their...__ Electronics Projects for You
Speed Control Of DC Motor using Pulse-Width Modulation - Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage of digital ‘high’ to digital ‘low’ plus...__ Electronics Projects for You
Speed Controller for DC Motor - Here is a simple circuit to control the speed of a DC motor. it can be configured to control the sweep rate of automobiles’ windscreen wiper. The circuit comprises a timer NE555...__ Electronics Projects for You
Speed Controller for Film Projectors - Do you have old family movies on film? Have you watched them lately? You may be shocked by how much they have deteriorated over the years. They need to be transferred to DVD before the film deteriorates to the point where it is unwatchable. Video conversion is not as straightforward as you might think but this simple project enables you to do it.__ SiliconChip
Speed Controller for Small Cooling Fans - Small cooling fans are used in some equipment for cooling semiconductor devices. The circuit given here is of a simple automatic speed controller for a 12V, 0.6W (or 1.2W) cooling fan...__ Electronics Projects for You
Throttle Interface for the DC Motor Speed Controller - Last month, we presented the High-Power Reversible DC Motor Speed Controller. Here is a companion controller which works with a motorcycle-style throttle control. it also features a forward/reverse switch to control the motor direction.__ SiliconChip
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